Max Power is spot on, it was designed to leave room for the next winner. The 6 players descend in a V shape to make room for both the next winner and to help preserve the heisman image in the background, while giving it an almost completed look.

exactly, staff chose to use "recent" greats over all time greats since some of the younger kids and recruits are more familiar with them. All Time greats are already splattered all over those hallways.